I stayed in August 1994, just after it opened. It was very nice - low-rise, right on the golf course. Hopefully someone who has stayed more recently can expand on this.
I was driving, so did not use the shuttle. Nowever, this text is from the website:
The Sheraton Golf Parco De'Medici Hotel and Resort is a charming, country-style hotel surrounded by a 27-hole golf course. Easily reached from the Great Ring Road, the Sheraton is just 18 kilometers from Fiumicino Airport and 16 kilometers from the center of Rome. Guests may use the limited and scheduled airport/downtown shuttle services, which run regularly.